(Android™) JSON: Array of Objects

Here we have a JSON object that contains an array, where each element in the array is a JSON object. This example demonstrates how to access the objects contained within an array.

{ 
  "employees":[
    {"firstName":"John", "lastName":"Doe"},
    {"firstName":"Anna", "lastName":"Smith"},
    {"firstName":"Peter","lastName":"Jones"}
  ]
}

Chilkat Android™ Downloads Android™ Java Libraries Android C/C++ Libraries

// Important: Don't forget to include the call to System.loadLibrary
// as shown at the bottom of this code sample.
package com.test;

import android.app.Activity;
import com.chilkatsoft.*;

import android.widget.TextView;
import android.os.Bundle;

public class SimpleActivity extends Activity {

  private static final String TAG = "Chilkat";

  // Called when the activity is first created.
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    CkJsonObject json = new CkJsonObject();

    // This is the above JSON with whitespace chars removed (SPACE, TAB, CR, and LF chars).
    // The presence of whitespace chars for pretty-printing makes no difference to the Load
    // method. 
    String jsonStr = "{\"employees\":[{\"firstName\":\"John\", \"lastName\":\"Doe\"},{\"firstName\":\"Anna\", \"lastName\":\"Smith\"},{\"firstName\":\"Peter\",\"lastName\":\"Jones\"}]}";

    boolean success = json.Load(jsonStr);
    if (success != true) {
        Log.i(TAG, json.lastErrorText());
        return;
        }

    // Get the "employees" array.
    CkJsonArray employees = json.ArrayOf("employees");
    if (json.get_LastMethodSuccess() == false) {
        Log.i(TAG, "employees member not found.");
        return;
        }

    // Iterate over each employee, getting the JSON object at each index.
    int numEmployees = employees.get_Size();
    int i = 0;
    while (i < numEmployees) {

        CkJsonObject empObj = employees.ObjectAt(i);

        Log.i(TAG, "employee[" + String.valueOf(i) + "] = " + empObj.stringOf("firstName") + " " + empObj.stringOf("lastName"));

        i = i + 1;
        }


  }

  static {
      System.loadLibrary("chilkat");

      // Note: If the incorrect library name is passed to System.loadLibrary,
      // then you will see the following error message at application startup:
      //"The application <your-application-name> has stopped unexpectedly. Please try again."
  }
}